Improvement in stove-grates



WILLIAMDOYLE.

Improvement in Stove Grates.

Patented Nov- 28,1871.

Fig.3.

PATENT OFFICE.

WILLIAM DOYLE, OF ALBANY, NEW YORK.

IMPROVEMENT IN STOVE-GRATES.

Specification forming part of Letters Patent No. 121,236, dated November 28, 1871.

To all whom it may concern:

Be it known that I, WILLIAM DOYLE, of Albany, in the county of Albany and State of New York, have invented certain Improvements in Grates for Stoves and Furnaces, of which the following is a specification:

The first part of my invention relates to the construction of the bars of a circular grate in such a manner as to facilitate the effectual clearing out of ashes from the bottom of the burning fuel. The second part of my invention relates to the combination of a helical curve or screwthread with a circular grate so as to give a rising and a falling motion to the grate when shaken, or to reduce the capacity of the fire-pot when desired.

Figure l is a perspective view of my invention. Fig. 2 is a plan or top view of the same. Fig. 3 is a central vertical section of my invention in its place in the fire-pot and ash-pit of a stove. Fig. 4 is a central vertical section of the same at right angles to Fig. 3.

A is the ash-pit, and B the fire-pot of a stove or furnace. G is the grate-bar or support for the grate, and is constructed with three radial arms, a a and b, and a hollow center-piece or hub, g, within which are either helical grooves or ribs corresponding to similar ribs or grooves on the outside of center-pin h of grate D. The two opposite arms a a of said gratebar O serve as pivots, around which grate D has a downward vertical motion, for the purpose of dumping the grate, when required. The arm b extends from hub g to the back of the fire-pot and ash-pit, and at right angles to arms a a of said grate-bar O, as shown in Figs. 1, 2, and 3; and its outer end rests upon a recessed support, 1), as shown in Fig. 3, so as to keep the grate-bar O and grate D always in a horizontal position, except when required to dump the same, as above shown. Arms 0. a and b are bent downward near their outer ends, as shown at d d d in Fig. 1, for the purpose of permitting lugs or prongs f to pass when the grate D is rotated upon its center-pin h. D is the grate, of circular form, and having, preferably, curved arms united in the center to a hub, 10, and at their outer ends by a rim, m. The curved arms are thicker on the inner curve 1, and beveled downward to their outer curve r, so as to make the upper edge 1 of each arm as nearly a cutting edge as may be found practicable. On the under side of the rim of grate D are three similar and equi-distant prongs, f, one of which (the front one) is shown in Figs. 1 and 3. Said prongs f are for the purpose of shaking the grate by means of a shaker, E, in the wellknown and usual manner, as shown in Fig. 3. The center-pin h of grate D has screw-threads, either raised or grooved, upon its surface, and of about three inches pitch, so that one revolution of the grate will raise it three inches, or any other pitch desired. The arms of grate D are curved, in the direction shown in Figs. 1 and 2, for a right-hand helical curve or thread, and in the reverse direction for a left-hand thread.

It will be seen from the above that when the grate is shaken it will rise and fall alternately with each motion of the shaker; and that as the grate rises it will cut into and break up any clinker that may be upon its upper surface, or within the reach of its upward rise; and also, that if it be desired at any time to reduce the quantity of the mass of incandescent fuel within the fire -pot we have only to rotate the grate so as to cause it to raise the required height within the fire-pot, as shown in Fig. 4.

What I claim as new, and desire to secure by Letters Patent, is-

1. A circular rotating grate, constructed with either curved or straight arms, having one raised or cutting-edge l, substantially as and for the purpose herein shown and described.

2. The combination and arrangement, with a circular grate D, of a helically-grooved or ribbed center-pin, h, and a correspondingly ribbed or grooved hub, g, of grate-bar or rest 0, substantially as and for the purpose herein shown and specified.

WM. DOYLE.

Witnesses:

JAMES WRIGHT, EDWARD H. DOYLE. 

